Make it possible to install sentinel independently

README.md

@@ -133,6 +133,15 @@ class { 'redis::sentinel':
 }
 ```
 
+If installation without redis-server is desired, set `contain_redis` parameter to false, i.e
+```puppet
+class { 'redis::sentinel':
+  ...
+  contain_redis => false,
+  ...
+}
+```
+
 ### Soft dependency
 
 When managing the repo, it needs [puppetlabs/apt](https://forge.puppet.com/puppetlabs/apt).

REFERENCE.md

@@ -1451,13 +1451,13 @@ Note that this class requires the herculesteam/augeasproviders_sysctl module.
 
 #### Examples
 
-##### 
+#####
 
 ```puppet
 include redis::administration
 ```
 
-##### 
+#####
 
 ```puppet
 class {'redis::administration':
@@ -1509,6 +1509,15 @@ class {'redis::sentinel':
 }
 ```
 
+If installation without redis-server is desired, set `contain_redis` parameter to false, i.e
+```puppet
+class { 'redis::sentinel':
+  ...
+  contain_redis => false,
+  ...
+}
+```
+
 #### Parameters
 
 The following parameters are available in the `redis::sentinel` class:
@@ -1908,6 +1917,14 @@ Data type: `Stdlib::Ensure::Service`
 
 Default value: `'running'`
 
+##### <a name="-redis--sentinel--contain_redis"></a>`contain_redis`
+
+Data type: `Boolean`
+
+Require redis base class. If set to false, sentinel is installed without redis server.
+
+Default value: `true`
+
 ## Defined types
 
 ### <a name="redis--instance"></a>`redis::instance`
@@ -1917,7 +1934,7 @@ multiple redis instances on one machine without conflicts
 
 #### Examples
 
-##### 
+#####
 
 ```puppet
 redis::instance {'6380':

manifests/sentinel.pp

@@ -148,6 +148,9 @@
 #     log_file   => '/var/log/redis/sentinel.log',
 #   }
 #
+# @param contain_redis
+#   Contain redis base class. If set to false, sentinel is installed without redis server.
+#
 class redis::sentinel (
   Optional[Variant[String[1], Sensitive[String[1]]]] $auth_pass = undef,
   Stdlib::Absolutepath $config_file = $redis::params::sentinel_config_file,
@@ -191,20 +194,25 @@
   Optional[Stdlib::Absolutepath] $notification_script = undef,
   Optional[Stdlib::Absolutepath] $client_reconfig_script = undef,
   Array[String[1]] $acls = [],
+  Boolean $contain_redis = true,
 ) inherits redis::params {
   $auth_pass_unsensitive = if $auth_pass =~ Sensitive {
     $auth_pass.unwrap
   } else {
     $auth_pass
   }
 
-  contain 'redis'
+  if $contain_redis {
+    contain 'redis'
+  }
 
   if $package_name != $redis::package_name {
     stdlib::ensure_packages([$package_name], {
         ensure => $package_ensure
     })
-    Package[$package_name] -> Class['redis']
+    if $contain_redis {
+      Package[$package_name] -> Class['redis']
+    }
   }
   Package[$package_name] -> File[$config_file_orig]